Parts for your 2010 Suzuki Splash-Temperature sensors

2010 Suzuki Splash temperature-sensors — what they do and how to look after them

Temperature-sensors are absolutely fitted to the 2010 Suzuki Splash. Factory workshop information for the Splash/Agila B platform (K10B/K12B petrol and 1.3 DDiS diesel) lists an Engine Coolant Temperature (ECT) sensor as part of the engine management, and OBD‑II standards (SAE J1979, PID 05) require the ECU to report coolant temperature. That means the Splash can’t run properly without temperature-sensors feeding data to the ECU and the instrument cluster.

On this model, temperature-sensors help the car start cleanly, run smoothly, and keep its cool under the bonnet. The ECT sensor tells the ECU how warm the engine is, so it can set fuel mixture and ignition timing, switch the radiator fans, and control idle speed. Other temperature-sensors contribute too, from measuring incoming air to looking after the air‑con evaporator, and even reporting outside temperature on the dash.

• Engine Coolant Temperature (ECT): core input for fuelling, fans, and gauge.
• Intake Air Temperature (IAT): trims fuelling, often combined with the airflow/pressure sensor.
• Ambient temperature: feeds the dash and HVAC logic.
• A/C evaporator temperature: prevents the evaporator icing up.

Servicing-wise, there’s no scheduled replacement for the ECT or IAT on a healthy Splash, but they’re worth a quick check every service (10,000–15,000 km). Look for brittle wiring, greenish corrosion on terminals, or oil/coolant contamination around the connector. If you’ve got hard cold starts, a stubborn high idle, the radiator fans running at odd times, a misreading gauge, or poor fuel economy, scan for fault codes (P0115–P0119 range) and review live data. A cold engine should read close to ambient, warmed up, expect roughly 85–95 °C on the ECT.

Replacing the ECT sensor is a straightforward DIY with basic spanners: let the engine go stone cold, relieve any cooling system pressure, and drain a litre or so of coolant below sensor level. Unplug the connector, swap the sensor and its seal/O‑ring, tighten to the workshop spec, then refill with the correct Suzuki‑approved long‑life coolant mix. Bleed air, check for leaks, clear any codes, and verify temperatures on a short drive. For longevity, keep connectors clean and clipped, fix any coolant weeps early, and stick to proper coolant changes so the sensor tip isn’t attacked by old, acidic coolant.

Where is the coolant temperature sensor on a 2010 Suzuki Splash?

On the K‑series petrol engines it’s typically threaded into the thermostat housing or nearby coolant outlet at the front/side of the engine. Look for a small two‑pin connector on a brass or black‑bodied sensor. Access is usually from above with the intake ducting moved aside. The diesel DDiS has a similar placement on its coolant outlet.

What are the tell‑tale signs a temperature-sensor is failing?

Common clues include rough cold starts, a higher‑than‑normal idle when warm, the radiator fans running constantly or not at all, a fuel bill creeping up, and a temp gauge that doesn’t make sense. Scan tools may show implausible readings, like a stone‑cold engine reporting 60 °C, and you may see fault codes in the P0115–P0119 range.

Do I need to replace the ECT sensor as preventative maintenance?

Not usually. They’re solid-state thermistors and can last many years. Focus on prevention: fresh coolant at the correct intervals, clean connectors, and fixing any wiring chafe. Replace the sensor if readings are off, it triggers codes, or there’s evidence of internal leakage or terminal corrosion that cleaning won’t fix.